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NUCLEAR REACTORS; FUEL ELEMENTS (CARTRIDGES), NON-IRRADIATED, FOR NUCLEAR REACTORS; MACHINERY AND APPARATUS FOR ISOTOPIC SEPARATION

SKINS AND OTHER PARTS OF BIRDS, WITH THEIR FEATHERS OR DOWN, FEATHERS AND PARTS OF FEATHERS (WHETHER OR NOT WITH TRIMMED EDGES) AND DOWN, NOT FURTHER WORKED THAN CLEANED, DISINFECTED OR TREATED FOR PRESERVATION; POWDER AND WASTE OF FEATHERS OR PARTS OF FE